Backlight unit

Abstract

A backlight unit includes a first lamp to emit light, a light-guiding plate to generate a surface light source with the light emitted from the first lamp, a light-diffusion sheet provided on the light-guiding plate to diffuse the light passing through the light-guiding plate, a prism sheet including a plurality of prism peaks arranged in a first direction, for condensing the light passing through the light-diffusion sheet, and a lenticular lens sheet including a plurality of lenticular lenses arranged in a second direction perpendicular to the first direction, for re-condensing the light passing through the prism sheet.

1 . A backlight unit comprising: 
 a first lamp to emit light;    a light-guiding plate to receive the light emitted from the first lamp to generate a surface light source;    a light-diffusion sheet provided on the light-guiding plate to diffuse the light passing through the light-guiding plate;    a prism sheet including a plurality of prism peaks arranged in a first direction, to condense the light passing through the light-diffusion sheet; and    a lenticular lens sheet including a plurality of lenticular lenses arranged in a second direction perpendicular to the first direction, to re-condense the light passing through the prism sheet.    
     
     
         2 . The backlight unit of  claim 1 , 
 wherein the prism sheet further includes a first light-condensing film to which the light is incident through the light-guiding plate; and    wherein the plurality of prism peaks include angular points on the first light-condensing film and are arranged along the first direction in parallel as a stripe shape.    
     
     
         3 . The backlight unit of  claim 1 , 
 wherein the lenticular lens sheet further includes a second light-condensing film to which the light is incident through the prism sheet; and    wherein the plurality of lenticular lenses are formed on the second light-condensing film along the second direction in parallel as a stripe shape.    
     
     
         4 . The backlight unit of  claim 1 , wherein each of the plurality of lenticular lenses includes a cross section of a curved shape, the curved shape being one of a semicircle, an elliptical, a cardioid, and a cycloid.  
     
     
         5 . The backlight unit of  claim 1 , wherein the first lamp is provided at a first side of the light-guiding plate.  
     
     
         6 . The backlight unit of  claim 1 , further comprising: 
 a lamp housing provided at the first side of the light-guiding plate to surround an incident surface of the light-guiding plate and the first lamp; and    a reflecting plate provided below the light-guiding plate.    
     
     
         7 . The backlight unit of  claim 1 , further comprising: 
 a second lamp to emit light, wherein the second lamp is provided at a second side of the light guiding plate.    
     
     
         8 . The backlight unit of  claim 7 , further comprising: 
 a lamp housing provided at the second side of the light-guiding plate to surround an incident surface of the light-guiding plate and the second lamp; and    a reflecting plate provided below the light-guiding plate.    
     
     
         9 . The backlight unit of  claim 7 , wherein the second side is the side of the light guiding plate opposite to the first side.  
     
     
         10 . A backlight unit comprising: 
 a first lamp to emit light;    a light-guiding plate including an incident surface at a first side thereof to change a progressing direction of the light emitted from the first lamp to be vertical;    a prism sheet to condense the light passing through the light-guiding plate in a vertical direction; and    a lenticular lens sheet to re-condense the light passing through the prism sheet in a horizontal direction.    
     
     
         11 . The backlight unit of  claim 10 , wherein the prism sheet is positioned on the light-guiding plate in a first direction, and the lenticular lens sheet is positioned on the prism sheet in a second direction.  
     
     
         12 . The backlight unit of  claim 11 , 
 wherein the prism sheet further includes a first light-condensing film to which the light is incident through the light-guiding plate; and    wherein the plurality of prism peaks include angular points on the first light-condensing film and are arranged along the first direction in parallel as a stripe shape.    
     
     
         13 . The backlight unit of  claim 11 , 
 wherein the lenticular lens sheet further includes a second light-condensing film to which the light is incident through the prism sheet; and    wherein the plurality of lenticular lenses are formed on the second light-condensing film along the second direction in parallel as a stripe shape.    
     
     
         14 . The backlight unit of  claim 13 , wherein each of the lenticular lenses includes a cross section of a curved shape, the curved shape being one of a semicircle, an elliptical, a cardioid and a cycloid.  
     
     
         15 . The backlight unit of  claim 10 , wherein the first lamp is provided at a first side of the light-guiding plate.  
     
     
         16 . The backlight unit of  claim 7 , further comprising: 
 a lamp housing provided at the first side of the light-guiding plate to surround the incident surface of the light-guiding plate and the first lamp;    a light-diffusion sheet provided between the light-guiding plate and the prism sheet to diffuse the light passing through the light-guiding plate; and    a reflecting plate provided below the light-guiding plate.    
     
     
         17 . The backlight unit of  claim 10 , further comprising: 
 a second lamp to emit light, wherein the second lamp is provided at a second side of the light guiding plate.    
     
     
         18 . The backlight unit of  claim 17 , further comprising: 
 a lamp housing provided at the second side of the light-guiding plate to surround an incident surface of the light-guiding plate and the second lamp; and    a reflecting plate provided below the light-guiding plate.    
     
     
         19 . The backlight unit of  claim 17 , wherein the second side is the side of the light guiding plate opposite to the first side.